Using
Echo
in this case is safe only if there is no risk of varying
transmission asymmetry.
GPSSyncErr
: when GPS synchronization is lost, synchronization of the line
differential function continues for 16 s based on the stability in the local IED
clocks. After that, setting
Block
blocks the line differential function or setting
Echo
keeps it on by using the
Echo
synchronization method.
Using
Echo
in this case is safe only if there is no risk of varying
transmission asymmetry.
CommSync
defines the
Master
and
Slave
relation in the communication system,
and should not be mistaken for the synchronization of line differential current
samples. When direct fibre is used, one LDCM is set as
Master
and the other as
Slave
. When a modem and multiplexer is used, the IED is always set as
Slave
because the telecommunication system provides the clock master.
OptoPower
has two settings:
LowPower
is used for fibres 0 – 1 km and
HighPower
for fibres >1 km.
ComAlarmDel
defines the time delay for communication failure alarm. In
communication systems, route switching can sometimes cause interruptions with a
duration of up to 50 ms. Too short a time delay can thus cause nuisance alarms.
ComAlrmResDel
defines the time delay for communication failure alarm reset.
RedChSwTime
defines the time delay before switching over to a redundant channel
in case of primary channel failure.
RedChRturnTime
defines the time delay before switching back to the primary
channel after channel failure.
AsymDelay
denotes asymmetry which is defined as transmission delay minus
receive delay. If fixed asymmetry is known,
Echo
synchronization method can be
used, provided that
AsymDelay
is properly set. From the definition follows that
asymmetry is always positive at one end and negative at the other end.
MaxTransmDelay
indicates maximum transmission delay. Data for maximum 40
ms transmission delay can be buffered up. Delay times in the range of some ms are
common. If data arrive in wrong order, the oldest data is disregarded.
MaxtDiffLevel
indicates the maximum time difference allowed between internal
clocks in respective line ends.
64 kbit mode specific settings
TransmCurr
is used to select among the following:
1MRK 506 375-UEN A
Section 19
Remote communication
Railway application RER670 2.2 IEC
457
Application manual
Summary of Contents for RELION RER670
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